Book Image

Kubernetes and Docker - An Enterprise Guide

By : Scott Surovich, Marc Boorshtein
Book Image

Kubernetes and Docker - An Enterprise Guide

By: Scott Surovich, Marc Boorshtein

Overview of this book

Containerization has changed the DevOps game completely, with Docker and Kubernetes playing important roles in altering the flow of app creation and deployment. This book will help you acquire the knowledge and tools required to integrate Kubernetes clusters in an enterprise environment. The book begins by introducing you to Docker and Kubernetes fundamentals, including a review of basic Kubernetes objects. You’ll then get to grips with containerization and understand its core functionalities, including how to create ephemeral multinode clusters using kind. As you make progress, you’ll learn about cluster architecture, Kubernetes cluster deployment, and cluster management, and get started with application deployment. Moving on, you’ll find out how to integrate your container to a cloud platform and integrate tools including MetalLB, externalDNS, OpenID connect (OIDC), pod security policies (PSPs), Open Policy Agent (OPA), Falco, and Velero. Finally, you will discover how to deploy an entire platform to the cloud using continuous integration and continuous delivery (CI/CD). By the end of this Kubernetes book, you will have learned how to create development clusters for testing applications and Kubernetes components, and be able to secure and audit a cluster by implementing various open-source solutions including OpenUnison, OPA, Falco, Kibana, and Velero.
Table of Contents (20 chapters)
1
Section 1: Docker and Container Fundamentals
5
Section 2: Creating Kubernetes Development Clusters, Understanding objects, and Exposing Services
9
Section 3: Running Kubernetes in the Enterprise

Chapter 1

  1. Correct answer: (B) False. A container that is based on one architecture cannot be run on a different architecture. For example, an image created using the x86 architecture will not run on an ARM-based architecture.
  2. Correct answer: (D) Union filesystem. Docker uses the Union filesystem to manage multiple image layers. The layers are read from top to bottom to provide the appearance of a single filesystem.
  3. Correct answer: (D) Overlay2. A system running a kernel that's version 4.0 or above will use the Overlay2 storage driver.
  4. Correct answer: (C) Container layer. Any changes that are made to a running container's filesystem are stored in the topmost layer, called the container layer.
  5. Correct answer: (C) docker exec -it <container> /bin/bash. The docker exec command is used to execute a process in a container. Using the -it option tells the exec command to use an interactive terminal for its execution. The process you want to execute is the...